Hi Paul, I use cork to make my oiler gaskets with. I'd say it about 3/32" thick. The smaller the bits of cork - the better. Joe "Pip" Betz said that. jlb94 at juno.com - - - www.oldengine.org/members/betz ,-._,-. http://community.webshots.com/user/pipbetz \/)"(\/ " If you want to see what Betty buys - (_o_) you have to see through Betty's eyes."